While the formulation of BCS theory was preceded by the experimental observations of Onnes in 1911 [1]}, [2]}, observation of spatially non-uniform pairing superconducting states in spin-imbalanced systems remains an experimental challenge despite considerable effort across a wide range of physical systems, including heavy fermion systems [3]}, iron-based superconductors [4]}, [5]}, [6]}, [7]}, asymmetric \(d\) -wave superfluids [8]}, layered organic superconductors [9]}, [10]}, [11]}, [12]}, layered superconductor-ferromagnet hybrid structures [13]}, quasicrystals [14]} and ultracold atomic gases [15]}, [16]}.
